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RU-PA40D 40 W Stereo Audio Amplifier with VCA - 8 Ω, with Power Supply

RU-PA40D 40 W Stereo Audio Amplifier with VCA - 8 Ω, with Power Supply

Radio Design Labs - 40 W Stereo Audio Amplifier with VCA - 8 Ω, with Power Supply



  • VCA Controlled Stereo Audio Power Amplifier
  • 20 Watts RMS per Channel into 8 Ω – 40 Watts Total
  • 15 Watts RMS per Channel into 4 Ω – 30 Watts Total
  • Unbalanced RCA Jack Inputs; Balanced Detachable Terminal Block Inputs
  • VCA Control on Detachable Terminal Block
  • External Control Using 10 KΩ Potentiometer or 0 to 10 Vdc
  • Compatible with RDL Remote Level Controls
  • Switch‑Selectable Stereo or Mono Operation
  • Studio Quality, Aurally Transparent Compressor/Limiter
  • Compressor/Limiter Controls Clipping
  • Compressor Produces Maximized Average Output Power
  • Compression Enabled Using Input Level Adjustments
  • LED to Indicate Audio Compression Threshold
  • High‑Efficiency Class D Operation
  • Thermal and Short‑Circuit Protection
  • RU‑PA40D includes North American Cord; RU‑PA40DE excludes Power Cord

The RU‑PA40D is the ideal choice in many applications where a high quality, high‑efficiency utility amplifier is needed to drive a pair of 4 Ω or 8 Ω speakers. It is specifically suited to amplification applications where users need to adjust the gain. Examples include projectors or monitors with fixed audio outputs used in classrooms, boardrooms or video conferencing. The RU‑PA40D is ideal for foreground sound amplification in small to medium rooms or in a specific zone within a retail space.

The RU‑PA40D features two balanced line‑level inputs on a detachable terminal block. Two unbalanced line level inputs are available on high‑reliability gold plated phono (RCA) jacks. A front‑panel gain control trimmer permits setting the maximum gain for each channel. The gain range accommodates the range of typical balanced and unbalanced audio signal levels. Each of the two RU‑PA40D outputs will drive a 4 Ω or 8 Ω speaker or multiple speakers connected to present a 4 Ω or 8 Ω load to the amplifier. The output impedance is switch‑selectable on the front panel of the module.

The RU‑PA40D is equipped with an internal stereo VCA for setting the output level on both amplifier channels. A detachable terminal block provides for the connection of an external 10 KΩ potentiometer or a 0 to 10 Vdc control voltage. RDL remote controls are available to provide single‑turn, multi‑turn (rotary encoder) or pushbutton (ramp or fixed level selection) user level control. VCA control insures long term noise‑free level adjustment. Remote control is possible using audio, control or common computer network wire.

A front‑panel switch is provided to sum the audio inputs to mono. In the STEREO mode, the RU‑PA40D independently amplifies each audio channel, left (L) and right (R). If speaker placement in the specified installation is incompatible with stereo amplification, the INPUT MODE switch may be set to SUMMED MONO.

The RU‑PA40D includes a stereo analog compressor/limiter for audio fidelity noticeably superior to conventional class D amplifiers with digital limiting. The input GAIN settings determine whether the limiter alone is used for clipping suppression, or if the full compressor/limiter will be used to substantially increase the average output power beyond that of a standard 40 W amplifier. A red front‑panel LED flashes when the limiter is preventing output clipping. The RU‑PA40D, with compression, is capable of producing average audio output levels and clarity normally expected from stereo amplifiers with a much higher output power rating.

A blue POWER LED illuminates when the RU‑PA40D is powered from its external 24 Vdc power supply (included). The module is equipped with both thermal and output short‑circuit protection. The high‑efficiency Class D output stages produce minimal heat for all levels of expected voice or music modulation.

Typical Performance:

Inputs (4):

Line level: Balanced (+4 dBu) Left and Right, Unbalanced (‑10 dBV) Left and Right

Input Impedance:

50 kΩ balanced, 20 kΩ unbalanced

Gain Adjustments (2):

Single turn, one per channel

Minimum Input Levels:

‑11 dBu balanced, ‑18 dBV unbalanced (to cross compressor threshold)

Maximum Input Levels:

+22 dBu balanced, +12 dBV unbalanced

VCA Control:

External 0 to 10 Vdc (linear), 10 kΩ linear taper potentiometer, RDL remote controls10 Vdc VCA reference voltage output provided

Frequency Response:

20 Hz to 20 kHz (+/‑ 1 dB, 4 or 8 Ohms)*

THD+N:

< 0.1% (1 kHz, 1 W, 4 or 8 Ohms); < 1% (50 Hz to 20 kHz,)*
*measured at compressor threshold level equaling 12 W RMS (8 Ohms) output power

Compressor:

Threshold nominally 2 dB below rated output, automatically adjusting attack and release times

Crosstalk:

Better than 60 dB (1 kHz, no compression)

Noise (below 20 W RMS):

< ‑80 dB (VCA control 6.25V; output level 6 dB below max.) < ‑70 dB (VCA control max.)

Selectors (2):

Slide switches: Output Impedance 4 Ohms or 8 Ohms; Input Mode SUMMED MONO or STEREO

Output Power:

20 W RMS into 8 Ω per channel, 40 W RMS total; 15 W RMS into 4 Ω per channel, 30 W RMS total

Output Circuit:

Class D

Ambient Operating Environment:

0° C to 40° C Maximum; 20° C Recommended

Indicators (2):

Red LED: THRESHOLD LED indicates compressor activity; Blue LED: POWER on

Power Supply (included):

100 to 240 Vac, 50‑60 Hz, 1.5A; 24 Vdc output to module


VCA Controlled Stereo Audio Power Amplifier, 20 Watts RMS per Channel into 8 Ω – 40 Watts Total, 15 Watts RMS per Channel into 4 Ω – 30 Watts Total, Unbalanced RCA Jack Inputs; Balanced Detachable Terminal Block Inputs , VCA Control Detachable Terminal Block, External Control Using 10 KΩ Potentiometer 0 to 10 Vdc, Compatible with RDL Remote Level Controls, Switch-Selectable Stereo Mono Operation, Studio Quality, Aurally Transparent Compressor/Limiter, Compressor/Limiter Controls Clipping, Compressor Produces Maximized Average Output Power, Compression Enabled Using Input Level Adjustments, LED to Indicate Audio Compression Threshold , High-Efficiency Class D Operation, Thermal Short-Circuit Protection, RU-PA40D includes North American Cord; RU-PA40DE excludes Power Cord, The RU-PA40D ideal choice in many applications where high quality, high-efficiency utility amplifier needed to drive pair of 4 Ω 8 Ω speakers It specifically suited to amplification applications where users need to adjust gain Examples include projectors monitors fixed audio outputs used in classrooms, boardrooms video conferencing RU-PA40D ideal foreground sound amplification in small to medium rooms in specific zone within retail space, The RU-PA40D features two balanced line-level inputs detachable terminal block Two unbalanced line level inputs available high-reliability gold plated phono (RCA) jacks front-panel gain control trimmer permits setting maximum gain channel gain range accommodates range of typical balanced unbalanced audio signal levels of two RU-PA40D outputs will drive 4 Ω 8 Ω speaker multiple speakers connected to present 4 Ω 8 Ω load to amplifier output impedance switch-selectable front panel of module, The RU-PA40D equipped an internal stereo VCA setting output level both amplifier channels detachable terminal block provides connection of an external 10 KΩ potentiometer 0 to 10 Vdc control voltage RDL remote controls available to provide single-turn, multi-turn (rotary encoder) pushbutton (ramp fixed level selection) user level control VCA control insures long term noise-free level adjustment Remote control possible using audio, control common computer network wire, A front-panel switch provided to sum audio inputs to mono In STEREO mode, RU-PA40D independently amplifies audio channel, left (L) right (R) If speaker placement in specified installation incompatible stereo amplification, INPUT MODE switch set to SUMMED MONO, The RU-PA40D includes stereo analog compressor/limiter audio fidelity noticeably superior to conventional class D amplifiers digital limiting input GAIN settings determine whether limiter alone used clipping suppression, if full compressor/limiter will used to substantially increase average output power beyond that of standard 40 W amplifier red front-panel LED flashes when limiter preventing output clipping RU-PA40D, compression, capable of producing average audio output levels clarity normally expected from stereo amplifiers much higher output power rating, A blue POWER LED illuminates when RU-PA40D powered from its external 24 Vdc power supply (included) module equipped both thermal output short-circuit protection high-efficiency Class D output stages produce minimal heat levels of expected voice music modulation, format converter Data/Installation

Mounting Accessories:

Mounting Kit - RU, ST and TX SeriesMB-1
Mounting Kit - RU, ST and TX Series

Mounting Kit - RU and TX SeriesMB-2
Mounting Kit - RU and TX Series

19" Universal Rack Chassis - RU, ST and TX SeriesRC-1U
19" Universal Rack Chassis - RU, ST and TX Series

19" Rack Mount for 3 RACK-UP Series ProductsRU-RA3A
19" Rack Mount for 3 RACK-UP Series Products

19" Rack Mount for 3 RACK-UP Series ProductsRU-RA3
19" Rack Mount for 3 RACK-UP Series Products

Single Wide Enclosure - RACK-UP MountsUC-1
Single Wide Enclosure - RACK-UP Mounts

Double Wide Enclosure - RACK-UP MountsUC-2
Double Wide Enclosure - RACK-UP Mounts

Table Top Chassis for RU, ST and TX SeriesWDG1
Table Top Chassis for RU, ST and TX Series

Mounting Bracket for RACK-UP SeriesRU-BR1
Mounting Bracket for RACK-UP Series

RACK-UP Filler Panel (and Reverse Mounting Kit)RU-FP1
RACK-UP Filler Panel (and Reverse Mounting Kit)

Wall Mount Plate for RACK-UP Series ProductsRU-WMP1
Wall Mount Plate for RACK-UP Series Products

RACK-UP DIN Rail AdapterDRA-35R
RACK-UP DIN Rail Adapter

Pole Mount TrayPM-2T
Pole Mount Tray

General Accessories:

Accessory Mounting SystemAMS
Accessory Mounting System

Wiring Harness Adapter - RACK-UP SeriesRU-WHA4
Wiring Harness Adapter - RACK-UP Series

Related Products:

FP-PA20
20 W Mono Audio Amplifier - 8 Ω

RU-PA518
10 W Stereo / 18 W Mono Audio Amplifier - 8 Ω

ST-PA18
18 W Mono Audio Amplifier - 8 Ω

ST-PA2
2 W Mono Audio Amplifier - 8 Ω

ST-PA6
6 W Mono Audio Amplifier - 8 Ω

TX-PA40D
40 W Stereo Audio Amplifier - 8 Ω, with Power Supply

EZ-MXA20
20 W Stereo Audio Mixer-Amplifier with EQ - 8 Ω, with Power Supply

EZ-PA20
20 W Stereo Audio Amplifier - 8 Ω, with Power Supply

PM-3T
Pole Mount Tray

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Copyright © 2010 Radio Design Labs, Inc. RDL, Radio Design Labs, the RDL logo, STICK-ON, RACK-UP and the Rack-Up logo are registered trademarks of Radio Design Labs, Inc. Flat-Pak, RCX, SourceFlex, SupplyFlex, Sure-Lok, TX, ULTRASTYLE, and Specialists in Practical Precision Engineering are trademarks of Radio Design Labs, Inc. All other trademarks are the property of their respective owners. Typical Performance reflects product at publication time exclusive of EMC data, if any, supplied with product. Date last modified: June 29 2010

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